On February 17, 2016, some 40,000 people rallied in Washington. These protestors included eco-socialists marching under the banner “system change, not climate change”. Socialist and Marxist ideas – largely taboo since the Cold War ended – seemingly have gained momentum again, at least among environmentalists advocating structural changes. More broadly, environmentalists increasingly recognize that they should not just protect ecosystems, but also promote social well being and equality.